Ventilation system, air conditioner, ventilation structure, shielding member and connecting set

Abstract

To provide a connector set for connecting a stationary plate and a movable plate of a shield member.SOLUTION: Four connectors 70 each have a ball support part 710 having a ball part at a tip via a connection end part formed with a thickness smaller than the diameter of the ball part, and a synthetic resin ball receiving part 720 having a grip part that detachably grips the ball part at a tip. The grip part comprises a pad part having a semi-spherical inner face, and a plurality of pressing parts protruding from the peripheral edge of the pad part and brought into elastic contact with a semi-spherical portion on the opposite side of a semi-spherical portion that is abutted on the pad part on the surface of the ball part. The plurality of pressing parts is provided around a center axis G1 of the grip part. Gaps 725E, in which the connection end part of the ball support part can be put in the state of connecting the ball support part and the ball receiving part, are formed between the respective pressing parts in a first direction D1 orthogonal to the center axis and in a second direction D2 orthogonal to the center axis G1 and the first direction D1, from the center axis.SELECTED DRAWING: Figure 11

Description

【Technical Field】 【0001】 The present invention relates to a ventilation device, an air conditioner, a ventilation structure, a shielding member, and a connector set. 【Background Art】 【0002】 A conventional ventilation device 200 shown in FIG. 26 includes a main body 210 installed in a ceiling space S21 by means of a hanging bracket or the like, a heat exchanger that performs heat exchange between outdoor air and indoor air, an exhaust blower, and a supply blower. In the main body 210, a lower opening 211 is formed in the case, and through this lower opening 211, an air intake port, a filter housing portion, etc. are exposed downward. A shielding member 220 is attached to the main body 210 to shield the lower opening 211 of the main body 210 from the interior of the room. 【0003】 The shielding member 220 includes a ceiling penetration portion 221 that passes through an opening 310 in the ceiling 300, and a cover 222 that covers the opening at the lower end of the ceiling penetration portion 221. By an exhaust blower (not shown) provided in the main body 210, indoor air in the living space S22 below the ceiling 300 flows into the shielding member 220 through the gap between the cover 222 and the ceiling penetration portion 221 and is sent to the main body 210. Then, it is exhausted outdoors through an exhaust duct 230 connected to the main body 210. 【0004】 A ventilation device is disclosed in Patent Document 1 in which the main body to which the duct is connected is arranged in the ceiling space, and indoor air is sucked in from a lower opening provided in the main body and opening to the indoor side leading to the duct and exhausted outdoors. 【0005】 In the ventilation device 200 shown in FIG. 26, the cover 222 is provided so as to be openable and closable by a hinge 223, and as shown by a one-dot chain line in FIG. 26, the cover 222 can be opened to clean the inside of the shielding member 220. 【Prior Art Documents】 【Patent Documents】 【0006】 [Patent Document 1] Japanese Patent Application Publication No. 11-281119 [Overview of the Initiative] [Problems that the invention aims to solve] 【0007】 Based on the plan for supplying and exhausting air to each room, ductwork is arranged and the ventilation device 200 is installed in the space S21 above the ceiling. However, since the axis for opening and closing the cover 222 is predetermined at a specific position on the ventilation device 200, when the cover 222 is opened, the gap w between the cover 222 and the wall 400 of the room or corridor may become narrow. In this way, if the gap w between the cover 222 and the wall 400 is narrow even when the cover 222 is opened, it is not easy to perform maintenance on the ventilation device 200, such as cleaning the inside of the shielding member 220. This problem is not limited to heat exchange type ventilation devices that draw in indoor air from the space below, but can also occur when the ventilation openings of a ventilation device fixed to a building are shielded with a plate, and this plate moves around an axis provided at a specific position. Furthermore, the same applies when the air conditioning vents of an air conditioner fixed to a building are shielded with a plate, or when the vents of a building are shielded with a plate. 【0008】 Therefore, the present invention aims to provide a ventilation device, an air conditioner, a ventilation structure, a shielding member, and a connecting set. [Means for solving the problem] 【0009】 The present invention provides a ventilation device comprising: a main body disposed in the space above the ceiling and connected to a duct; and a shielding member that shields a lower ventilation opening of the main body facing downward, wherein the shielding member comprises: a fixed plate formed in an annular shape with an opening positioned below the lower opening; a movable plate; and a connector that connects the fixed plate and the movable plate, wherein the movable plate has a pair of first edges extending in the x-axis direction, where the x-coordinate increases along the x-axis perpendicular to the z-axis, passing through the opening of the fixed plate and increasing as one moves upward from the opening; and a pair of second edges extending in the y-axis direction, where the y-coordinate increases along the y-axis perpendicular to the z-axis and the x-axis, and the contour is formed in the shape of a right quadrilateral, and the connector is formed between the corner of the movable plate and the corner of the fixed plate opposite to this corner Each of the four connectors is positioned between the opposing parts, and further, the connector comprises a ball support portion having a ball portion at its tip, which protrudes from one opposing surface of the corner opposing part of the fixed plate and the corner of the movable plate, and a synthetic resin ball receiving portion having a gripping portion at its tip that detachably grips the ball portion, and the four connectors are positioned with the ball support portion and the ball receiving portion connected, the movable plate is positioned at a distance from the fixed plate in the opposite direction of the z axis along the z axis where the z coordinate decreases, the lower opening is shielded, and when the movable plate is moved from the state in which the lower opening is shielded by the movable plate to expose the lower opening, of the four connectors, The aforementioned x-axis direction or The aforementioned Two parts aligned in the y-axis direction connect the ball support portion and the ball receiving portion. Let The movable plate maintains a certain state and forms an axis that serves as the center of its movement, and furthermore, four of these axes are provided in a selectable manner. 【0010】 When exposing the lower opening from a state where it is shielded, the connection of two connectors aligned in the x-axis or y-axis direction can be released, while the connection of the remaining connector can be maintained, allowing the movable plate to move. This is because, when the two connected connectors are aligned in the x-axis direction, their ball portions are also aligned in the x-axis direction, and one of the ball support portion and ball receiving portion of the two connected connectors, which is provided on the movable plate, can be moved with the imaginary line connecting the ball portions as the center (axis) of movement. When the two connected connectors are aligned in the y-axis direction, their ball portions are also aligned in the y-axis direction, and the movable plate can move with the imaginary line connecting the ball portions as the center (axis) of movement. In this invention, when opening the movable plate to expose the lower opening, there are four ways to open it: two sets of the two connecting members that support the movable plate in the connected state are arranged in the x-axis direction and two sets are arranged in the y-axis direction. When opening the movable plate, one of these four ways of opening can be selected to expose the lower opening. 【0011】 The ventilation device of the present invention comprises a gripping portion which includes a pad portion having a hemispherical inner surface, and a plurality of pressing portions which protrude from the periphery of the pad portion and elastically contact the hemispherical portion on the surface of the ball portion that is opposite to the hemispherical portion that is in contact with the pad portion. 【0012】 Multiple retaining parts constitute the ball inlet / outlet. The elastic retaining parts deform to expand the ball inlet / outlet, and after expansion, the retaining parts return to their original positions, allowing the ball to be inserted and removed. Thus, the ball support part and the ball receiving part can be releasably connected, and the state in which the ball is inserted into the gripping part can be maintained. 【0013】 In the ventilation device of the present invention, preferably, with the movable plate covering the lower opening, the gripping portion is The aforementioned z axis reverse Multiple pressing parts around the central axis of the gripping part that extends in the direction And the first gap and the second gap formed between the aforementioned pressing portions,is provided, and the four connectors When projected onto the xy-plane, one The aforementioned connector is is in the first quadrant, one The aforementioned connector is is in the second quadrant, one The aforementioned connector is is in the third quadrant, one The aforementioned connector is is in the fourth quadrant The aforementioned the first quadrant of the connector in is The first gap from the central axis The aforementioned in the x-axis direction Located , The second gap from the central axis The aforementioned in the y-axis direction Located , The aforementioned the second quadrant of the connector in is The first gap from the central axis The aforementioned the opposite x-axis direction (x-axis reverse direction) to the x-axis direction Located , The second gap from the central axis The aforementioned in the y-axis direction Located , The aforementioned the third quadrant of the connector in is The first gap from the central axis The aforementioned in the x-axis reverse direction Located , The second gap from the central axis The aforementioned the opposite y-axis direction (y-axis reverse direction) to the y-axis direction Located , The aforementioned the fourth quadrant of the connector in is The first gap from the central axis The aforementioned in the x-axis direction Located , The second gap from the central axis The aforementioned in the y-axis reverse direction Located , the ball support portion is formed thinner than the ball portion and has a connection end portion connected to the ball portion. When exposing the lower opening, the ball support portion and the ball receiving portion are connected Let When two of the connectors that hold the connected state The aforementioned are arranged in the x-axis direction, the connection end portion of the ball support portion is inserted into the second gap, and the ball support portion and the ball receiving portion are connected Let When two of the connectors that hold the connected state The aforementionedWhen they are aligned in the y-axis direction, the connecting end of the ball support portion is inserted into the first gap. 【0014】 When moving the movable plate, the two connected connectors have a first gap and a second gap, which are positioned in the direction in which the connecting ends move relative to the gripping part, with the imaginary line connecting their ball parts as the center (axis). When the two connected connectors are aligned in the y-axis direction, the first gap is positioned perpendicular to the imaginary line connecting their ball parts. When the two connected connectors are aligned in the x-axis direction, the second gap is positioned perpendicular to the imaginary line connecting their ball parts. 【0015】 With the gripping portion gripping the ball portion and the ball support portion and the ball receiving portion connected, inserting the connecting end into the first gap changes the position of the connecting end from the ball entrance / exit position to the second gap, or inserting the connecting end into the second gap changes the position of the connecting end from the ball entrance / exit position to the second gap, thereby significantly changing the angle formed by the ball support portion and the ball receiving portion centered on the ball portion. This allows the movable plate to change its angle significantly, from a position that shields the lower opening to a position that exposes the lower opening, centered around a virtual line connecting the ball joints. The material of the ball support portion is not limited, but may be made of synthetic resin such as ABS resin or metal such as aluminum alloy. 【0016】 The present invention relates to an air conditioner having a lower opening overlooking a room below the ceiling, comprising a shielding member that shields the lower opening, the shielding member comprising a fixed plate formed in an annular shape with an opening positioned below the lower opening, a movable plate, and a connector that connects the fixed plate and the movable plate, the movable plate having a pair of first edges extending in the x-axis direction, where the x-coordinate increases along the x-axis perpendicular to the z-axis which increases as the z-coordinate increases as the z-coordinate increases as the z-coordinate increases as the z-coordinate increases along the y-axis which is perpendicular to the z-axis and the x-axis, and having a contour formed in the shape of a right quadrilateral, the connector being positioned between the corner of the movable plate and the corner-facing portion of the fixed plate opposite to this corner Furthermore, the connector comprises a ball support portion having a ball portion at its tip, which protrudes from one opposing surface of the corner portion of the fixed plate and the corner portion of the movable plate, and a synthetic resin ball receiving portion having a gripping portion at its tip that detachably grips the ball portion, and the four connectors are connected to the ball support portion and the ball receiving portion, and the movable plate is positioned at a distance from the fixed plate in the opposite direction of the z axis along the z axis where the z coordinate decreases, thereby shielding the lower opening, and when the movable plate is moved from the state in which the lower opening is shielded by the movable plate to expose the lower opening, of the four connectors, The aforementioned x-axis direction or The aforementioned Two parts aligned in the y-axis direction connect the ball support portion and the ball receiving portion. Let The movable plate maintains a certain state and forms an axis that serves as the center of its movement, and furthermore, four of these axes are provided in a selectable manner. 【0017】 The present invention provides a ventilation structure that allows air to circulate between floors forming a flow path and between adjacent rooms separated by the ceiling. The aforementionedThe ceiling is equipped with a shielding member that shields a vent formed in the ceiling, the shielding member comprising a fixed plate formed in an annular shape with an opening positioned below the vent, a movable plate, and a connector that connects the fixed plate and the movable plate, the movable plate having a contour of a right quadrilateral with a pair of first edges extending in the x-axis direction such that the x-coordinate increases along the x-axis perpendicular to the z-axis which increases as the z-coordinate increases as the z-coordinate increases upward from the opening of the fixed plate, and a pair of second edges extending in the y-axis direction such that the y-coordinate increases along the y-axis which is perpendicular to the z-axis and the x-axis, the connector being positioned between the corner of the movable plate and the corner of the fixed plate opposite to this corner, and further the connector The device comprises, a ball support portion having a ball portion at its tip, which protrudes from one opposing surface of the corner portion of the fixed plate and the corner portion of the movable plate, and a ball receiving portion made of synthetic resin having a gripping portion at its tip that detachably grips the ball portion, and the four connectors are connected to the ball support portion and the ball receiving portion, and the movable plate is positioned at a distance from the fixed plate in the opposite direction of the z axis along the z axis where the z coordinate decreases, thereby shielding the vent, and when the movable plate is moved from the state in which the vent is shielded by the movable plate to expose the vent, of the four connectors, The aforementioned x-axis direction or The aforementioned Two parts aligned in the y-axis direction connect the ball support portion and the ball receiving portion. Let The movable plate maintains a certain state and forms an axis that serves as the center of its movement, and furthermore, four of these axes are provided in a selectable manner. 【0018】 This invention relates to ventilation for buildings. OrA shielding member for shielding an air vent for air conditioning, or an air vent for a ventilation device or air conditioner fixed to the building, comprising: a fixed plate formed in an annular shape with an opening leading to the air vent; a movable plate; and a connector for connecting the fixed plate and the movable plate, wherein the movable plate has a pair of first edges extending in the x-axis direction, where the x-coordinate increases along the x-axis perpendicular to the z-axis, which increases as the z-coordinate increases from the opening toward the air vent, and a pair of second edges extending in the y-axis direction, where the y-coordinate increases along the y-axis perpendicular to the z-axis and the x-axis, and the contour is formed in the shape of a right quadrilateral, and the connector is positioned between the corner of the movable plate and the corner of the fixed plate opposite to this corner, Furthermore, the connector comprises a ball support portion having a ball portion at its tip, which protrudes from one opposing surface of the corner portion of the fixed plate and the corner portion of the movable plate, and a synthetic resin ball receiving portion having a gripping portion at its tip that detachably grips the ball portion, and the four connectors are connected to the ball support portion and the ball receiving portion, and the movable plate is positioned at a distance from the fixed plate in the opposite direction of the z axis along the z axis where the z coordinate decreases, thereby shielding the vent, and when the movable plate is moved from the state in which the vent is shielded by the movable plate to expose the vent, of the four connectors, The aforementioned x-axis direction or The aforementioned Two parts aligned in the y-axis direction connect the ball support portion and the ball receiving portion. Let The movable plate maintains a certain state and forms an axis that serves as the center of its movement, and furthermore, four of these axes are provided in a selectable manner. 【0019】 The present invention relates to a set of four connectors for connecting a fixed plate formed in an annular shape and a movable plate whose contour is formed in the shape of a right-angled quadrilateral that shields the ventilation opening of the fixed plate, and for positioning between the corner of the movable plate and the corner opposite to the fixed plate, in order to expose the opening of the fixed plate, the set of four connectors for forming four axes that serve as the center of the movement of the movable plate, which are formed by imaginary lines connecting the ball portions, parallel to the contour, wherein the connectors are for attachment to one of the fixed plate and the movable plate, and the ball portion is connected to this ball portion Thinner The device comprises a ball support portion having a ball support portion at its tip via a formed connecting end, and a ball receiving portion made of synthetic resin having a gripping portion at its tip for detachably gripping the ball portion, which is attached to the other of the fixed plate and the movable plate, wherein the gripping portion comprises a pad portion having a hemispherical inner surface, and a plurality of pressing portions protruding from the periphery of the pad portion and elastically contacting a hemispherical portion on the surface of the ball portion that is opposite to the hemispherical portion that abuts the pad portion, and the plurality of pressing portions are arranged around the central axis of the gripping portion and connect the ball support portion and the ball receiving portion. Let In this state, the gap into which the connecting end of the ball support portion can be inserted is such that the distance from the central axis is perpendicular to the first direction and the central axis and The aforementioned It is characterized in that the pressing portions are formed between each other in a second direction perpendicular to the first direction. By providing four of these connectors on the shielding member, unlike conventional shielding members, the movable plate can be opened in a direction that facilitates maintenance of ventilation equipment, etc., depending on the usage environment. 【0020】 Furthermore, the connector set of the present invention preferably has a second base to which the ball receiving portion is fixed to the fixed plate or the movable plate. Department And the aforementioned second base Department It comprises a second extension portion extending vertically from the base portion, a gripping portion provided at the tip of the second extension portion, and a second reinforcing portion extending vertically from the second base portion, wherein the second reinforcing portion extends through the side surface of the second extension portion to the side surface of one of the pressing portions positioned between the two gaps. The second reinforcing part reinforces one of the pressing parts positioned between the two gaps, thereby preventing deformation and other damage. [Effects of the Invention] 【0021】 According to the shielding member of the present invention, the movable plate can be opened using any of the four opening methods, and since a wide space can be secured when the movable plate is opened, maintenance work such as cleaning the ventilation system can be easily performed. Furthermore, by connecting the fixed plate and the movable plate using the connector of the present invention, a shielding member with four different opening methods can be constructed. [Brief explanation of the drawing] 【0022】 [Figure 1] This is a cross-sectional view of a heat exchange type ventilation device according to the first embodiment of the present invention. [Figure 2] Figure 1 is a perspective view of the shielding member of a heat exchange ventilation system. [Figure 3] Figure 2 is a plan view of the shielding member. [Figure 4] Figure 2 is a plan view of the ceiling insertion portion and fixing plate of the shielding member. [Figure 5] Figure 2 is a plan view of the movable plate of the shielding member. [Figure 6] This is a front view showing the first connector in which the ball support portion and the ball receiving portion of the shielding member shown in Figure 2 are connected. [Figure 7] (a) is a perspective view of the ball support section in Figure 6, (b) is a left side view of the ball support section, and (c) is a front view of the ball support section. [Figure 8] (a) is a perspective view of the ball bearing section in Figure 6, and (b) is a plan view of the ball bearing section. [Figure 9] (a) is a cross-sectional view of the first connector along the line A1-A1 in Figure 6, and (b) is an end view of the ball bearing portion along the line A2-A2 in Figure 8(b). [Figure 10](a) is a plan view showing the ball bearing portion of the first connector and the corner portion of the movable plate, (b) is a plan view showing the ball bearing portion of the second connector and the corner portion of the movable plate, (c) is a plan view showing the ball bearing portion of the third connector and the corner portion of the movable plate, and (d) is a plan view showing the ball bearing portion of the fourth connector and the corner portion of the movable plate. [Figure 11] This is a perspective view of a connector set used in the manufacture of a heat exchange type ventilation system according to the first embodiment of the present invention. [Figure 12] (a) is a diagram showing the movable plate, fixed plate, and the second and third connectors on one of the second edges in the closed state, and (b) is a diagram showing the movable plate, fixed plate, and the second and third connectors on one of the second edges in the open state by the first opening method. [Figure 13] This is a cross-sectional view along the line A3-A3 in Figure 12(b). [Figure 14] This is a perspective view showing the shielding member in the open position of the movable plate, as determined by the first method of opening. [Figure 15] This is a perspective view showing the shielding member in the open position of the movable plate, as achieved by the second opening method. [Figure 16] (a) is a diagram showing the movable plate, fixed plate, and the first and second connectors on one of the first edges in the closed state, and (b) is a diagram showing the movable plate, fixed plate, and the first and second connectors on one of the first edges in the open state by the third opening method. [Figure 17] This is a cross-sectional view along the line A4-A4 in Figure 16(b). [Figure 18] This is a perspective view showing the shielding member in the open position of the movable plate, as achieved by the third method of opening it. [Figure 19] This is a perspective view showing the shielding member in the open position of the movable plate, as determined by the fourth opening method. [Figure 20] (a) and (b) are diagrams illustrating the operation of a heat exchange type ventilation device according to the first embodiment of the present invention. [Figure 21] This is a cross-sectional view of a modified example of a heat exchange type ventilation device according to the first embodiment of the present invention. [Figure 22] (a) is a perspective view of a ventilation device according to a second embodiment of the present invention, and (b) is a cross-sectional view of the ventilation device shown in (a). [Figure 23] (a) is a perspective view of an air conditioner according to a third embodiment of the present invention, and (b) is a cross-sectional view of the air conditioner shown in (a). [Figure 24] This is a cross-sectional view of a ventilation structure according to a fourth embodiment of the present invention. [Figure 25] This is a cross-sectional view illustrating other examples of use for the shielding member. [Figure 26] This is a diagram illustrating a conventional ventilation system. [Modes for carrying out the invention] 【0023】 Embodiments of the present invention will be described below with reference to the drawings. 【0024】 [First Embodiment] The heat exchange ventilation device 1 shown in Figure 1 comprises a main body 10 that is placed in the space S11 above the ceiling and performs heat exchange, a duct connection part 20 for connecting a duct to the main body 10, and a shielding member 30 that shields the lower opening of the main body 10 for ventilation that faces downward. 【0025】 In the following explanation, the shielding member 30 will be described in the state shown in Figures 1 to 3, where the lower opening 111 of the main body 10 is shielded by the shielding member 30, with the origin of the xyz coordinate system placed at the center of the opening 500 of the fixing plate 50, which will be described later. The z coordinate is set to pass through the opening 500 and increase as you move upward from the opening 500. The direction in which the x coordinate increases along the x axis is called the x-axis direction, the direction in which the y coordinate increases along the y axis is called the y-axis direction, and the direction in which the z coordinate increases along the z axis is called the z-axis direction. In the heat exchange ventilation device 1, the central axis G2 of the shielding member 30 is set to be coaxial with the z axis, and these extend vertically. The opposite direction of the x-axis direction is called the opposite x-axis direction, the opposite direction of the y-axis direction is called the opposite y-axis direction, and the opposite direction of the z-axis direction is called the opposite z-axis direction. 【0026】 (Main body 10) The main body 10, although its cross-sectional structure is not shown in the diagram, includes an air intake passage through which outside air flows, an exhaust passage through which indoor air flows, a heat exchanger that performs heat exchange between the outside air and the indoor air, and exhaust and air intake fans such as sirocco fans, all housed within the case. The heat exchanger is a laminated structure made by alternately stacking exhaust sheets, each having a small passage for exhaust indoor air, and supply sheets, each having a small passage for supply outside air. It is positioned within the main body, for example, at the point where the exhaust flow path and the supply flow path intersect. 【0027】 The main unit 10 is installed in the middle of an air supply duct that sends outside air from an intake in the exterior wall to an air supply vent in the ceiling of a living room, etc., and is also installed in the middle of an exhaust duct that sends indoor air from an exhaust vent in the ceiling of a bathroom, etc., to an exhaust vent in the exterior wall. For example, the main unit 10 is located in the space S11 above the ceiling of a corridor. The case of the main body 10 has a lower opening 111 in the panel that forms the bottom surface, and a part of the components housed in the case is exposed through this lower opening 111. This exposed area is formed as a recessed recess 112. 【0028】 (Filter device) Furthermore, the main unit 10 is equipped with a filter device 15 that collects foreign matter such as dust and dirt contained in the outside air sent from outdoors to indoors. For example, the filter device 15 comprises a filter and a housing section provided in the main body 10 for housing the filter. The housing section has an inlet and outlet for the filter in a recess 112 that is exposed through the lower opening 111 of the case of the main body 10, and the inlet and outlet are closed with a lid when the filter is housed in the housing section. The filter consists of a frame covered with fibrous material that collects dust and other particles. For example, if the filter becomes dirty, the lid can be removed, the used filter can be taken out of the storage compartment, and replaced with a new one. Furthermore, a recess 112 exposed through the lower opening 111 of the case is provided with an intake port 113 through which indoor air from the living space S12 below the ceiling 300 flows into the main body 10. An intake port filter 16 for collecting foreign matter contained in the air flowing into the intake port 113 may be detachably provided in the recess 112. This intake port filter 16 is also constructed, for example, by stretching a fibrous material that collects dust and dirt over a frame, and can be removed for replacement or cleaning. 【0029】 (Duct connection part 20) The duct connection section 20 is formed in the shape of a tapered cylinder, and ducts connected to the outside air intake and supply ports, and the indoor air exhaust and discharge ports are connected to the duct connection section 20. In Figure 1, the supply and exhaust systems are not distinguished, and the ducts are denoted by the reference numeral 91. 【0030】 (Shielding member 30) The shielding member 30 includes a ceiling insertion portion 40 that penetrates from a lower end portion 41 to an upper end portion 42 and has its upper end portion 42 fixed to the main body portion 10 and passed through an opening 310 in the ceiling 300, a fixed plate 50 formed in an annular shape with its inner periphery connected to the lower end portion 41 of the ceiling insertion portion 40, a movable plate 60, and four connectors 70 that connect the fixed plate 50 and the movable plate 60. 【0031】 The ceiling insertion section 40 has a horizontal cross-section that is either square or rectangular. Furthermore, the ceiling insertion portion 40 has a mounting portion 44 on its inner circumference that has a hole for a screw, and a main body side mounting portion that matches this mounting portion 44 is provided in a recess 112 of the main body portion 10. The ceiling insertion portion 40 is attached to the main body portion 10 by fixing the mounting portion 44 to the main body side mounting portion of the main body portion 10 with a screw when the upper end portion 42 has entered the recess 112 through the lower opening 111. By fixing the shielding member 30 to the main body portion 10, the opening 500 formed by the inner circumference of the fixing plate 50 is connected to the lower opening 111 and the intake port 113 of the main body portion 10. As shown in Figure 4, the fixing plate 50 has a right-angled quadrilateral shape in its contour when viewed from above. The ceiling insertion portion 40 and the fixing plate 50 are not limited to a specific material, but may be made of synthetic resin such as ABS resin, and may be molded together as one piece, or the fixing plate having an opening 500 for indoor air to pass through and the cylindrical ceiling insertion portion may be molded separately and then joined together. 【0032】 (Movable plate 60) Like the fixed plate 50, the movable plate 60 has a right-angled quadrilateral shape in plan view, as shown in Figure 5. The movable plate 60 is not limited to a specific material, but it is made of synthetic resin such as ABS resin. Furthermore, the movable plate 60 is provided with a third reinforcing portion 65 that protrudes from the surface facing the fixed plate 50. The third reinforcing portion 65 comprises a pair of first protrusions 651 extending in the x-axis direction, a pair of second protrusions 652 extending in the y-axis direction, and a connecting portion 653 where the first protrusions 651 and the second protrusions 652 are connected to form an outward corner toward the corner 61 of the movable plate 60, and is formed in the shape of a right quadrilateral when viewed from above from the surface facing the fixed plate 50. Note that the third reinforcing portion 65 is omitted in Figure 1, and in Figures 6, 9, 10, 12, 13, 16, 17, 20, and 21 described later. 【0033】 The fixed plate 50 and the movable plate 60 each have four corners 51, 61, and the dimensions of their four sides are set to be approximately the same. As will be described in more detail later, the movable plate 60 is connected by four connectors 70, and as shown in Figures 1 and 2, the corners 61 of the movable plate 60 are positioned below the corners 51 of the fixed plate 50, thereby shielding the opening 500 of the fixed plate 50, the lower opening 111 of the main body 10, and the recess 112. 【0034】 The fixed plate 50 and the movable plate 60 are each provided with a pair of first edges 50A, 60A extending in parallel, and a pair of second edges 50B, 60B extending in parallel with the first edges 50A, 60A, with their orientation changed by 90 degrees. Furthermore, in the state where the fixed plate 50 is positioned parallel to the movable plate 60 below and shields the opening 500 of the fixed plate 50 (hereinafter referred to as the closed state), the first edges 50A and 60A extend in the x-axis direction, and the second edges 50B and 60B extend in the y-axis direction. 【0035】 The fixed plate 50 and the movable plate 60 are each formed with a square outline by a pair of first edges 50A, 60A and a pair of second edges 50B, 60B, with the dimensions of each first edge 50A, 60A and second edge 50B, 60B being, for example, 450mm to 600mm. Alternatively, they may be formed in a rectangular shape. 【0036】 Furthermore, the corner 51 of the fixed plate 50 is the point where the first edge 50A and the second edge 50B of the fixed plate 50 connect to form a corner, and also has a first opposing surface 50C that faces the movable plate 60, and this first opposing surface 50C is set a1 mm inward from the first edge 50A and a2 mm inward from the second edge 50B, for example a1 and a2 being 30 mm to 50 mm. 【0037】 The corner 61 of the movable plate 60 is also a place where the first edge 60A and the second edge 60B of the movable plate 60 connect to form a corner, and further has a second opposing surface 60C that faces the fixed plate 50, and this second opposing surface 60C is set inward by b1 mm from the first edge 60A and inward by b2 mm from the second edge 60B, for example b1 and b2 being 30 mm to 50 mm. 【0038】 Furthermore, the corners 51 of the fixed plate 50 and the corners 61 of the movable plate 60 are not limited to being directly connected, with the first edges 50A, 60A and the second edges 50B, 60B being directly connected. The connecting points may be formed as curved edges, notched edges, etc. In this case as well, it is preferable to set the dimensions of the curved edges or notched edges, etc. to be smaller than the dimensions of the first edges 50A, 60A and the second edges 50B, 60B, so that the fixed plate 50 and the movable plate 60 can be formed into right-angled quadrilaterals. 【0039】 (Connector 70) The connectors 70 are positioned between the four corners 51 of the fixed plate 50 and the four corners 61 of the movable plate 60. In Figure 3, a plan view of the shielding member 30 in the closed state, the four connectors 70 are shown through and parts of each are represented by dashed lines, while the parts visible through the opening 500 of the fixed plate 50 are represented by solid lines. The four connectors 70 are positioned apart in the x-axis and y-axis directions. 【0040】 Hereinafter, as shown in Figure 3, in a plan view of the shielding member 30, the connector 70 located in the first quadrant indicated by the arrow α1 in the xy plane will be referred to as the first connector 70A, and the remaining three connectors 70 will be referred to in counterclockwise order from the first connector 70A as follows: the connector 70 located in the second quadrant will be referred to as the second connector 70B, the connector 70 located in the third quadrant will be referred to as the third connector 70C, and the connector 70 located in the fourth quadrant will be referred to as the fourth connector 70D. When explaining without referring to a specific connector (first connector 70A, second connector 70B, third connector 70C, fourth connector 70D), it will simply be referred to as connector 70. Furthermore, of the four corners 61 of the movable plate 60, the one where the first connector 70A is located is called corner 61A, the one where the second connector 70B is located is called corner 61B, the one where the third connector 70C is located is called corner 61C, and the one where the fourth connector 70D is located is called corner 61D. 【0041】 First, let me explain the first connector 70A. As shown in Figure 6, the first connector 70A includes a ball support portion 710 protruding from a first opposing surface 50C of the corner 51 of the fixed plate 50 that faces the movable plate 60, and a ball receiving portion 720 protruding from a second opposing surface 60C of the corner 61A of the movable plate 60 that faces the fixed plate 50. 【0042】 As shown in Figure 7(a), the ball support portion 710 comprises a plate-shaped first base portion 711 attached to the first opposing surface 50C of the fixing plate 50, a first extension portion 712 extending vertically from the first base portion 711, a spherical ball portion 713 formed at the tip of the first extension portion 712, and a first reinforcing portion 714 that protrudes from the first base portion 711 and is connected to the side surface of the first extension portion 712 (side surface 712B excluding the connecting end portion 712A described later) and supports the first extension portion 712. The ball support portion 710 is made of synthetic resin, and the first base portion 711, the first extension portion 712, the ball portion 713, and the first reinforcing portion 714 are integrally molded. As shown in Figures 7(b) and (c), the ball portion 713 has a spherical surface 713A formed with a constant radius r1 from the center C, but the ball portion 713 has an outer shape in which a part of the sphere is missing, and a recess 713C is formed that is indented inward from this notch 713B. This recess 713C allows the ball portion 713 to be molded into a spherical shape. In Figure 7(c), the center C is represented by a black dot (●). The ball portion 713 forms the tip of the ball support portion 710 via the connecting end 712A of the first extension portion 712. The connecting end 712A of the first extension portion 712 is formed to be thin, with a thickness t1 smaller than the diameter of the sphere of the ball portion 713. In the illustrated example, the first extension portion 712 is formed in a rod shape including the connecting end 712A, but the shape of the first extension portion 712 is not limited to this, and it is acceptable as long as it has a connecting end 712A that is formed to be thinner than the ball portion 713. 【0043】 As shown in Figures 8(a) and (b), the ball receiving portion 720 includes a plate-shaped second base portion 721 attached to the second opposing surface 60C of the movable plate 60, a second extension portion 722 extending vertically from the second base portion 721, a gripping portion 723 formed at the tip of the second extension portion 722 for detachably gripping the ball portion 713, and a second reinforcing portion 724 protruding from the second base portion 721 and connected to the side surface 722A of the second extension portion 722 to support the second extension portion 722. The ball receiving portion 720 is made of synthetic resin, and the second base portion 721, the second extension portion 722, the gripping portion 723, and the second reinforcing portion 724 are integrally molded. 【0044】 As shown in Figures 9(a) and (b), the gripping portion 723 comprises a pad portion 723A having a hemispherical inner surface 727A, and a plurality of pressing portions 723B that protrude from the periphery of the pad portion 723A and elastically contact the hemispherical portion of the surface 713A of the ball portion 713 that is opposite to the hemispherical portion that is in contact with the pad portion 723A. The pressing portion 723B has a spherical forming portion 723C connected to the pad portion 723A and having an inner surface 727B that follows the surface of a virtual sphere, and a tip portion 723D formed on the opposite side of the spherical forming portion 723C from the pad portion 723A. The inner surfaces 727A and 727B of the gripping portion 723 constitute a ball receiving surface 727 that abuts against the surface 713A of the ball portion 713. This ball receiving surface 727 (inner surfaces 727A and 727B) is formed along the surface of a virtual sphere with radius r1, and the center of this virtual sphere coincides with the center C of the ball portion 713 when the ball portion 713 is gripped by the gripping portion 723, and in Figures 9(a) and (b), the center C of the ball portion 713 is represented by a black dot. In terms of thickness (dimension) in the direction perpendicular to the central axis G1 described later, the tip portion 723D is formed to be thicker than the spherical forming portion 723C. Each retaining portion 723B constitutes the tip of the ball receiving portion 720, and also constitutes the ball inlet / outlet 723E through which the ball portion 713 is inserted and removed, as will be described later. 【0045】 As shown in Figure 8, the gripping portion 723 is provided with four pressing portions 723B. If we define the central axis G1 of the gripping portion 723 as a virtual line perpendicular to the second opposing surface 60C of the corner portion 61A of the mounting site and passing through the center C of the spherical inner surface of the gripping portion 723, then the four pressing portions 723B are arranged in a circumferential direction so as to surround the central axis G1. In the arrangement of the four retaining portions 723B in the circumferential direction around the central axis G1, gaps are formed between the retaining portions 723B. Here, we will describe the gaps in detail. When viewing the ball receiving portion 720 of the first connector 70A in Figure 10(a) from the gripping portion 723 side (plan view), the first gap 725A, second gap 725B, third gap 725C, and fourth gap 725D are arranged at 90-degree intervals around the central axis G1 of the gripping portion 723. The first gap 725A and the third gap 725C are aligned in the x-axis direction with the central axis G1 in between, and the second gap 725B and the fourth gap 725D are aligned in the y-axis direction with the central axis G1 in between. In Figure 10, the central axis G1 is represented by ●. 【0046】 As shown in Figure 10(a), the first gap 725A is positioned in the x-axis direction from the central axis G1 of the gripping portion 723 toward the second edge 60B side which constitutes the corner 61A where the ball receiving portion 720 of the first connector 70A is provided. In Figure 10, the x-axis direction is represented by the arrow labeled d11. Furthermore, as shown in Figure 10(a), the second gap 725B is positioned in the y-axis direction from the central axis G1 of the gripping portion 723 toward the first edge 60A that constitutes the corner 61A where the ball receiving portion 720 of the first connector 70A is provided. In Figure 10, the y-axis direction is represented by the arrow with the symbol d21. 【0047】 Thus, in the gripping portion 723 of the ball receiving portion 720, there are gaps (first gap 725A, second gap 725B, third gap 725C, fourth gap 725D) between the pressing portions 723B. Therefore, each pressing portion 723B can widen the gap W70 between the opposing tip portions 723D with their central axis G1 positioned between them, allowing the ball portion 713 to be inserted and removed. When the gripping portion 723 is not gripping the ball portion 713, the gap W70 between the tip portions 723D of each pressing portion 723B is set to be smaller than the diameter of the ball portion 713 (W70 < 2r1). 【0048】 Then, from a state where the ball portion 713 of the ball support portion 710 is not gripped by the gripping portion 723 of the ball receiving portion 720, in order to grip the ball portion 713 with the gripping portion 723 of the ball receiving portion 720, the ball portion 713 can be inserted into the ball inlet 723E of the gripping portion 723, and the gap W70 between the tips 723D of the pressing portion 723B can be widened, thereby pushing the ball portion 713 into the gripping portion 723. Also, since the pressing portion 723B is elastic, when the ball portion 713 is inserted into the gripping portion 723, the pressing portion 723B returns to its original position. In this way, when the ball portion 713 is inserted into the gripping portion 723, the hemispherical portion of the ball portion 713 opposite to the hemispherical portion that contacts the inner surface of the pad portion 723A is pressed by the multiple pressing portions 723B, and the ball portion 713 is gripped. This maintains the connection between the ball support portion 710 and the ball receiving portion 720. In Figure 9(b), the ball portion 713 inserted into the gripping portion 723 and its connecting end portion 712A are shown by a dashed line, and when the movable plate 60 is closed, the connecting end portion 712A is positioned at the ball inlet / outlet 723E. 【0049】 As shown in Figure 8(b), the ball receiving portion 720 provided on the movable plate 60 further includes a contact portion 726 that contacts the first protrusion 651 and the second protrusion 652 that constitute the connection portion 653 of the third reinforcing portion 65. The contact portion 726 has an inner corner formed by a first contact portion 726A that contacts the first protrusion 651 of the connection portion 653 of the third reinforcing portion 65 and a second contact portion 726B that contacts the second protrusion 652 of the connection portion 653 of the third reinforcing portion 65. By applying the contact portion 726 to the connection portion 653 of the third reinforcing portion 65 so that the outer corner of the third reinforcing portion 65 fits into this inner corner, the ball receiving portion 720 can be positioned. Furthermore, the contact portion 726 and the second extension portion 722 extend vertically from the second base portion 721 and are connected via one of the three second reinforcing portions 724. 【0050】 Furthermore, in the gripping portion 723 of the ball receiving portion 720, a pressing portion 723B marked with the symbol α2 in Fig. 8(a) is disposed between the first gap 725A and the second gap 725B. Among the three second reinforcing portions 724, the second reinforcing portion 724A marked with the symbol α3 is formed from the second base portion 721 across the side surface 722A of the second extending portion 722 to the side surface α21 of the pressing portion α2 so as to reinforce the pressing portion α2. In the illustrated example, the second reinforcing portion 724A extends to the tip end portion 723D of the pressing portion α2 and supports the pressing portion α2 from the outside together with the second extending portion 722. The second reinforcing portion 724A prevents deformation of the pressing portion α2 and the like. 【0051】 Also, as shown in Fig. 8(b), the width W11 of the first gap 725A and the width W12 of the second gap 725B are formed wider than the width W13 of the third gap 725C and the width W14 of the fourth gap 725D. Specifically, the width W11 of the first gap 725A and the width W12 of the second gap 725B are set to be larger than the thickness t1 of the connecting end portion 712A of the ball support portion 710 (t1 < W11, t1 < W12). The first gap 725A and the second gap 725B are configured to be able to accommodate the connecting end portion 712A of the ball support portion 710. Different from these, the third gap 725C and the fourth gap 725D cannot accommodate the connecting end portion 712A of the ball support portion 710 (W13 < t1, W14 < t1). 【0052】 (Second coupler 70B, third coupler 70C, and fourth coupler 70D) The second coupler 70B, the third coupler 70C, and the fourth coupler 70D each include a ball support portion 710 and a ball receiving portion 720, similarly to the first coupler 70A. 【0053】 (Second coupler 70B) The first coupler 70A and the second coupler 70B disposed on one side of the first edges 50A and 60A are arranged symmetrically with respect to the yz plane of x = 0 that longitudinally cuts through the central axis G2 of the shielding member 30, and are also formed symmetrically. In Fig. 3, the central axis G2 of the shielding member 30 is represented by ●. As shown in the plan view of the ball receiving portion 720 and corner portion 61B of the second connector 70B in Figure 10(b), in the ball receiving portion 720 of the second connector 70B, the first gap 725A is positioned in the opposite direction of the x-axis from the central axis G1 of the gripping portion 723 toward the second edge 60B that constitutes the corner portion 61B where the ball receiving portion 720 of the second connector 70B is provided. In Figure 10, the opposite direction of the x-axis is represented by the arrow with the symbol d12. Furthermore, as shown in Figure 10(b), in the ball receiving portion 720 of the second connector 70B, the second gap 725B is positioned in the y-axis direction (d21) from the central axis G1 of the gripping portion 723 toward the first edge 60A side which constitutes the corner portion 61B of the second connector 70B where the ball receiving portion 720 is provided. 【0054】 (Third connector 70C) The second connector 70B and the third connector 70C, which are positioned on one of the second edges 50B and 60B, are arranged and formed symmetrically with respect to the xz plane y=0 that passes through the central axis G2 of the shielding member 30. As shown in the plan view of the ball receiving portion 720 and corner portion 61C of the third connector 70C in Figure 10(c), in the ball receiving portion 720 of the third connector 70C, the first gap 725A is positioned in the opposite direction of the x-axis (d12) from the central axis G1 of the gripping portion 723 toward the second edge 60B side which constitutes the corner portion 61C where the ball receiving portion 720 of the third connector 70C is provided. Furthermore, as shown in Figure 10(c), in the ball receiving portion 720 of the third connector 70C, the second gap 725B is positioned in the opposite direction of the y-axis, from the central axis G1 of the gripping portion 723 toward the first edge 60A that constitutes the corner portion 61C where the ball receiving portion 720 of the third connector 70C is provided. In Figure 10, the opposite direction of the y-axis is represented by the arrow labeled d22. 【0055】 (Fourth connector 70D) The first connector 70A and the fourth connector 70D, which are located on the other second edge 50B, 60B side, are arranged and formed symmetrically with respect to the xz plane y=0 that passes through the central axis G2 of the shielding member 30. As shown in the plan view of the ball receiving portion 720 and corner portion 61D of the fourth connector 70D in Figure 10(d), in the ball receiving portion 720 of the fourth connector 70D, the first gap 725A is positioned in the x-axis direction (d11) from the central axis G1 of the gripping portion 723 toward the second edge 60B side which constitutes the corner portion 61D where the ball receiving portion 720 of the fourth connector 70D is provided. Furthermore, as shown in Figure 10(d), in the ball receiving portion 720 of the fourth connector 70D, the second gap 725B is positioned in the opposite direction of the y-axis (d22) from the central axis G1 of the gripping portion 723 toward the first edge 60A that constitutes the corner portion 61D where the ball receiving portion 720 of the fourth connector 70D is provided. 【0056】 (Closed position of the movable plate) The first connector 70A, the second connector 70B, the third connector 70C, and the fourth connector 70D each connect the ball support portion 710 and the ball receiving portion 720, so that, as shown in Figures 1 and 2, the movable plate 60 is held in a position below the fixed plate 50, and the lower opening 111 and recess 112 of the main body portion 10 are also blocked by the movable plate 60 positioned below and are not exposed to the interior. In this manner, with the movable plate 60 closed, the heat exchange ventilation device 1 draws in indoor air through the gap 55 between the movable plate 60 and the fixed plate 50 using an exhaust fan installed in the main body 10, and exhausts it to the outside through the exhaust system duct from the main body 10. 【0057】 In addition, in the closed state of the movable plate 60, as shown in FIGS. 6 and 9, the fixed plate 50 and the movable plate 60 are arranged at a distance in the z-axis direction, and the interval W56 between them is maintained, for example, at 30 mm to 50 mm. The interval W56 is the dimension in the z-axis direction from the first opposing surface 50C to the second opposing surface 60C. In the connector 70, the dimension (height) H1 of the ball support portion 710 protruding from the first opposing surface 50C is set to be larger than the dimension (height) H2 of the ball receiving portion 720 protruding from the second opposing surface 60C. Further, the center C of the ball portion 713 of the ball support portion 710 is arranged below and offset toward the second opposing surface 60C side from the middle between the first opposing surface 50C and the second opposing surface 60C in the z-axis direction. Specifically, the dimension (distance) Hc in the z-axis direction from the first opposing surface 50C to the center C of the ball portion 713 is set to be larger than the dimension obtained by halving the interval W56. Also, as shown in FIG. 6, when the first connector 70A is viewed in the y-axis direction from the fourth connector 70D, the dimension b3 in the x-axis direction from the center C of the ball portion 713 of the movable plate 60 to the second edge 60B is set to be smaller than the dimension Hc (b3 < Hc). Similarly, as shown in FIG. 9(a), when the first connector 70A is viewed in the negative x-axis direction from the side opposite to the second connector 70B, the dimension b4 in the y-axis direction from the center C of the ball portion 713 to the first edge 60A of the movable plate 60 is set to be smaller than the dimension Hc (b4 < Hc). 【0058】 The shielding member 30 configured in this way can be manufactured using the connector set 7 shown in Figure 11. The connector set 7 consists of four connectors 70. Here, the connectors 70 shown in Figure 11 are in their state before being placed between the fixed plate 50 and the movable plate 60. When the two gaps 725E used as the first gap 725A and the second gap 725B after being attached to the shielding member 30 are described in terms of the xyz coordinate system set for the shielding member 30. The two gaps 725E of each connector 70 are located in a first direction D1 perpendicular to the central axis G1 of the gripping portion 723 of the ball receiving portion 720, and in a second direction D2 perpendicular to the central axis G1 and the first direction D1, respectively. The reference numeral 725F in the figure indicates two gaps corresponding to the third gap 725C and the fourth gap 725D. The illustrated connector set 7 comprises two first-type connectors 700A and two second-type connectors 700B. The first-type connectors 700A and the second-type connectors 700B have different shapes. The first-type connector 700A is used as the first connector 70A and the third connector 70C, and the second-type connector 700B is used as the second connector 70B and the fourth connector 70D. Note that the four connectors may be formed in the same shape. 【0059】 (How to open movable plate 60) In the heat exchange ventilation device 1 of this embodiment, as will be described in detail later, when exposing the lower opening 111 of the main body 10 from a closed state, the movable plate 60 can be opened by releasing the connection of two connectors 70 aligned in the x-axis direction, maintaining the connection of the remaining two connectors 70, and moving the ball receiving portions 720s provided on the movable plate 60 of the two connectors 70 that remain connected, using an imaginary line connecting the ball portions 713 as the center of motion. Alternatively, the movable plate 60 can also be opened by releasing the connection of two connectors 70 aligned in the y-axis direction, maintaining the connection of the remaining two connectors 70, and moving the ball receiving portions 720s provided on the movable plate 60 of the two connectors 70 that remain connected, using an imaginary line connecting the ball portions 713 as the center of motion. Furthermore, in the heat exchange ventilation system 1, when opening the movable plate 60, there are four types of connectors 70, and the two connectors 70 that support the movable plate 60 in the connected state are arranged in two sets in the x-axis direction and two sets in the y-axis direction, so there are four ways to open the movable plate 60. 【0060】 (First method of opening) In the first opening method, the movable plate 60 is supported by a second connector 70B and a third connector 70C, which are positioned on one of the second edges 60B of the movable plate 60 and aligned in the y-axis direction, thereby opening the movable plate 60. As shown in Figure 2, when the movable plate 60 is lowered from a closed state in which the movable plate 60 shields the opening 500 of the fixed plate 50, the second edge 60B of the movable plate 60 widens at the gripping portions 723 of the first connector 70A and the fourth connector 70D, and the gap W70 between the tips 723D of the pressing portions 723B widens due to the ball portion 713, causing the ball portion 713 to detach from the gripping portion 723, and the connection state of the first connector 70A and the connection state of the fourth connector 70D is released. 【0061】 Furthermore, with respect to the second connector 70B and the third connector 70C on one of the second edges 60B of the movable plate 60, as shown in Figure 12(a), the two ball support parts 710 can be positioned at the ball inlet / outlet 723E of the gripping part 723, and the two ball parts 713 remain gripped by the gripping part 723. This allows the two ball receiving parts 720 to be moved using a virtual line L1 passing through the center C of the two ball parts 713 as the center of motion (axis). This virtual line L1 is parallel to the second edge 60B of the movable plate 60 and extends in the y-axis direction. 【0062】 With the movable plate 60 closed, the ball receiving portion 720 of the second connector 70B has a first gap 725A for inserting the connecting end 712A of the ball support portion 710 in a direction perpendicular to the imaginary line L1 connecting the centers C of the ball portions 713 of the second connector 70B and the third connector 70C, and the z-axis direction passing through this center C (in the opposite x-axis direction d12 as shown in Figure 10(b)). The ball receiving portion 720 of the third connector 70C also has a first gap 725A for inserting the connecting end 712A of the ball support portion 710 in a direction perpendicular to the imaginary line L1 connecting the centers C of the ball portions 713 of the second connector 70B and the third connector 70C, and the z-axis direction passing through this center C (in the opposite x-axis direction d12 as shown in Figure 10(c)). As a result, the second connector 70B and the third connector 70C, with the ball support portion 710 and the ball receiving portion 720 connected, can change the position of the connecting end 712A from the position of the ball inlet / outlet 723E to the position of the first gap 725A. Note that the portion of the first extension portion 712 on the fixing plate 50 side of the connecting end 712A is configured so as not to collide with the gripping portion 723. 【0063】 Then, as the ball receiving portions 720 of the second connector 70B and the third connector 70C move around the imaginary line L1 as an axis and insert the connecting end 712A (first extension portion 712) of the ball support portion 710 into the first gap 725A, the angle between the ball support portion 710 and the ball receiving portion 720 centered on the ball portion 713 changes significantly, as shown in Figure 12(b). Here, the angle θ11 between the ball support portion 710 and the ball receiving portion 720 in the open state of the movable plate 60 is the angle between the central axis G1 of the gripping portion 723 and the central axis G3 of the ball support portion 710, as shown in Figure 13, and the angle θ11 is 90 degrees. The central axis G3 is an imaginary line that passes through the center C of the ball portion 713 and is perpendicular to the first opposing surface 50C. The ball receiving portion 720 is prevented from moving further around the imaginary line L1 when the edge portion 723F of the pad portion 723A contacts the connecting end portion 712A (first extension portion 712) of the ball support portion 710. In this way, the connecting end portion 712A of the ball support portion 710 functions as a stopper. Angle θ10 is the angle formed between the ball support portion 710 and the ball receiving portion 720 when the movable plate 60 is in the closed state. In this case, the ball receiving portion 710 is in a state where its central axis G1 is extended vertically, and the central axis G1 of the gripping portion 723 coincides with the extension of the central axis G3 of the ball support portion 710. The maximum angle θ1 (=θ10-θ11) of movement around the imaginary line L1 from the closed state where the ball receiving portion 710 extends its central axis G1 vertically and the movable plate 60 is horizontally spread, until its movement is prevented by the stopper, is 90 degrees. In Figure 13, the center C (imaginary line L1) is represented by ●. 【0064】 The movable plate 60 is held open by its own weight, with the other second edge 60B side of the movable plate 60 lowered, and the other second edge 60B side facing upward, with the second opposing surface 60C facing sideways. At this time, on the second edge 60B side of the movable plate 60 where the second connector 70B and the third connector 70C are provided, a gap may be created between the edge 723F of the pad portion 723A and the stopper (connecting end 712A of the ball support portion 710), in which case the angle θ11 will be less than 90 degrees. Alternatively, the edge 723F of the pad portion 723A may contact the stopper (connecting end 712A of the ball support portion 710) to maintain the open state. 【0065】 In this way, by maintaining the connection states of the second connector 70B and the third connector 70C arranged in the y-axis direction, and moving their ball receiving portions 720 with the virtual line L1 as the center (axis) of operation, the movable plate 60 can be opened as shown in FIG. 14. Further, as shown in FIG. 6, since the dimension b3 in the x-axis direction from the second edge 60B of the movable plate 60 to the center C of the ball portion 713 is set smaller than the dimension Hc (b3 < Hc), the movable plate 60 can be opened without contacting the fixed plate 50. In the state where the movable plate 60 is opened as shown in FIG. 13, one second edge 60B of the movable plate 60 approaches the fixed plate 50 via the clearance CL1. When the movable plate 60 is opened, the lower opening 111 of the main body portion 10 and further the recess 112 are exposed. 【0066】 (Second opening method) In the second opening method, the movable plate 60 is supported by the first connector 70A and the fourth connector 70D arranged on the other second edge 60B side of the movable plate 60 and arranged in the y-axis direction, and the movable plate 60 is opened. As shown in FIG. 2, when one second edge 60B side (the second edge 60B side where the second connector 70B and the third connector 70C are provided) of the movable plate 60 is lowered from the closed state where the movable plate 60 shields the opening 500 etc. of the fixed plate 50, in each gripping portion 723 of the second connector 70B and the third connector 70C, the distance W70 between the tip portions 723D of the respective pressing portions 723B is widened by the ball portion 713 and the ball portion 713 disengages from the gripping portion 723, and the connection states of the second connector 70B and the third connector 70C are released. 【0067】 Also, in the first connector 70A and the fourth connector 70D on the other second edge 60B side, similar to the second connector 70B and the third connector 70C on one second edge 60B side shown in FIG. 12(a), from the state where the connection end portion 712A of the ball support portion 710 is arranged at the ball entrance / exit 723E of the gripping portion 723, while the two ball portions 713 are respectively held by the gripping portion 723, the two ball receiving portions 720 can be moved with the virtual line L1 passing through the centers C of the two ball portions 713 as the center (axis) of operation. In this case, the virtual line L1 is also parallel to the second edge 60B and extends in the y-axis direction. 【0068】 With the movable plate 60 in the closed position, the ball receiving portion 720 of the first connector 70A has a first gap 725A for inserting the connecting end 712A of the ball support portion 710 in a direction perpendicular to the imaginary line L1 connecting the centers C of the ball portions 713 of the first connector 70A and the fourth connector 70D, and the z-axis direction passing through this center C (the x-axis direction d11 shown in Figure 10(a)). The ball receiving portion 720 of the fourth connector 70D also has a first gap 725A for inserting the connecting end 712A of the ball support portion 710 in a direction perpendicular to the imaginary line L1 connecting the centers C of the ball portions 713 of the first connector 70A and the fourth connector 70D, and the z-axis direction passing through this center C (the x-axis direction d11 shown in Figure 10(d)). As a result, the first connector 70A and the fourth connector 70D, with the ball support portion 710 and the ball receiving portion 720 connected, can change the position of the connecting end 712A from the position of the ball inlet / outlet 723E to the position of the first gap 725A. 【0069】 Then, as the ball receiving portions 720 of the first connector 70A and the fourth connector 70D move around the imaginary line L1 as an axis, and the connecting end 712A (first extension portion 712) of the ball support portion 710 is inserted into the first gap 725A, the angle between the ball support portion 710 and the ball receiving portion 720, centered on the ball portion 713, changes significantly. 【0070】 In this way, by maintaining the connected state of the first connector 70A and the connected state of the fourth connector 70D, their ball receiving portions 720 move with the imaginary line L1 as the center of motion (axis), allowing the movable plate 60 to be opened and the lower opening 111 of the main body 10 to be exposed, as shown in Figure 15. 【0071】 (Third way to open it) In the third method of opening, the movable plate 60 is supported by a first connector 70A and a second connector 70B, which are positioned on one side of the first edge 60A and aligned in the x-axis direction, thereby opening the movable plate 60. As shown in Figure 2, when the movable plate 60 is lowered from a closed state in which the movable plate 60 shields the opening 500 of the fixed plate 50, the other first edge 60A side of the movable plate 60 (the first edge 60A side on which the third connector 70C and the fourth connector 70D are provided) widens the gap between the tips 723D of the respective gripping portions 723B of the third connector 70C and the fourth connector 70D due to the ball portion 713, causing the ball portion 713 to detach from the gripping portion 723, and releasing the connection between the third connector 70C and the fourth connector 70D. 【0072】 Furthermore, at the first connector 70A and the second connector 70B on one of the first edges 60A of the movable plate 60, as shown in Figure 16(a), the connecting end 712A of the ball support portion 710 is positioned at the ball inlet / outlet 723E of the gripping portion 723. With the two ball portions 713 still being gripped by the gripping portion 723, the two ball receiving portions 720 can be moved parallel to each other with a virtual line L2 passing through the centers C of the two ball portions 713 as the center (axis) of movement. Note that in this case, the virtual line L2 is parallel to the first edge 60A and extends in the x-axis direction. 【0073】 With the movable plate 60 closed, the ball receiving portion 720 of the first connector 70A has a second gap 725B for inserting the connecting end 712A of the ball support portion 710 in a direction perpendicular to the imaginary line L2 connecting the centers C of the ball portions 713 of the first connector 70A and the second connector 70B, and the z-axis direction passing through this center C (y-axis direction d21 as shown in Figure 10(a)). The ball receiving portion 720 of the second connector 70B also has a second gap 725B for inserting the connecting end 712A of the ball support portion 710 in a direction perpendicular to the imaginary line L2 connecting the centers C of the ball portions 713 of the first connector 70A and the second connector 70B, and the z-axis direction passing through this center C (y-axis direction d21 as shown in Figure 10(b)). As a result, with the ball support portion 710 and the ball receiving portion 720 connected, the position of the connecting end 712A can be changed from the position of the ball inlet / outlet 723E to the position of the second gap 725B. 【0074】 Then, as the ball receiving portions 720 of the first connector 70A and the second connector 70B move around the imaginary line L2 as an axis and insert the connecting end 712A (first extension 712) of the ball support portion 710 into the second gap 725B, the angle between the ball support portion 710 and the ball receiving portion 720 centered on the ball portion 713 changes significantly, as shown in Figure 16(b). Here, the angle θ21 between the ball support portion 710 and the ball receiving portion 720 in the open state of the movable plate 60 is the angle between the central axis G1 of the gripping portion 723 and the central axis G3 of the ball support portion 710, as shown in Figure 17, and the angle θ21 is 90 degrees. The ball receiving portion 720 is prevented from moving further around the imaginary line L2 by bringing the edge 723F of the pad portion 723A into contact with the connecting end 712A (first extension 712) of the ball support portion 710. The connecting end 712A of the ball support portion 710 functions as a stopper. The maximum angle θ2 (=θ10-θ21) of movement around the imaginary line L2 from the closed state in which the ball receiving portion 710 extends its central axis G1 vertically and the movable plate 60 spreads horizontally, until the movement is restricted by the stopper (connecting end 712A of the ball support portion 710), is 90 degrees. In Figure 17, the center C (imaginary line L2) is represented by a black dot. 【0075】 The movable plate 60 is held open by its own weight, with the other first edge 60A side of the movable plate 60 lowered, and the other first edge 60A side facing upward, with the second opposing surface 60C facing sideways. At this time, a gap may be created between the edge 723F of the pad portion 723A and the stopper (connecting end 712A of the ball support portion 710), in which case the angle θ21 will be less than 90 degrees. Alternatively, the edge 723F of the pad portion 723A may contact the stopper (connecting end 712A of the ball support portion 710) to maintain the open state. 【0076】 In this way, by maintaining the connection states of the first connector 70A and the second connector 70B and allowing their ball receiving portions 720 to move with the virtual line L2 as the center (axis) of operation, the movable plate 60 can be opened as shown in FIG. 18. Also, as shown in FIG. 9(a), since the dimension b4 in the y-axis direction from the first edge 60A of the movable plate 60 to the center C of the ball portion 713 is set smaller than the dimension Hc (b4 < Hc), the movable plate 60 can be opened without contacting the fixed plate 50. In the state where the movable plate 60 is opened as shown in FIG. 17, one first edge 60A of the movable plate 60 approaches the fixed plate 50 via the clearance CL2. When the movable plate 60 is opened in this way, the lower opening 111 of the main body portion 10 and the like can be exposed. 【0077】 (Fourth opening method) In the fourth opening method, the movable plate 60 is supported by the third connector 70C and the fourth connector 70D arranged on the other first edge 60A side of the movable plate 60 and aligned in the x-axis direction, and the movable plate 60 is opened. As shown in FIG. 2, when one first edge 60A side of the movable plate 60 (the first edge 60A side where the first connector 70A and the second connector 70B are provided) is lowered from the closed state where the movable plate 60 shields the opening 500 of the fixed plate 50 and the like, the distance between the tip portions 723D of the respective pressing portions 723B in the respective gripping portions 723 of the first connector 70A and the second connector 70B is widened by the ball portion 713, and the ball portion 713 disengages from the gripping portion 723, releasing the connection states of the first connector 70A and the second connector 70B. 【0078】 Furthermore, with respect to the third connector 70C and fourth connector 70D on the other first edge 60A side of the movable plate 60, similar to the third opening method shown in Figure 16(a) (a configuration in which the movable plate 60 is opened while maintaining the connected state of the first connector 70A on one first edge 60A side and maintaining the connected state of the second connector 70B), the two ball receiving parts 720 can be moved with the two ball parts 713 still being gripped by the gripping part 723, using a virtual line L2 passing through the center C of the two ball parts 713 as the center (axis) of movement. Note that in this case, the virtual line L2 is also parallel to the first edge 60A and extends in the x-axis direction. 【0079】 With the movable plate 60 closed, the ball receiving portion 720 of the third connector 70C has a second gap 725B for inserting the connecting end 712A of the ball support portion 710 in a direction perpendicular to the imaginary line L2 connecting the centers C of the ball portions 713 of the third connector 70C and the fourth connector 70D, and the z-axis direction passing through this center C (in the opposite direction of the y-axis, d22, as shown in Figure 10(c)). The ball receiving portion 720 of the fourth connector 70D also has a second gap 725B for inserting the connecting end 712A of the ball support portion 710 in a direction perpendicular to the imaginary line L2 connecting the centers C of the ball portions 713 of the third connector 70C and the fourth connector 70D, and the z-axis direction passing through this center C (in the opposite direction of the y-axis, d22, as shown in Figure 10(d)). As a result, the third connector 70C and the fourth connector 70D can change the position of the connecting end 712A from the position of the ball inlet / outlet 723E to the position of the second gap 725B while the ball support portion 710 and the ball receiving portion 720 are connected. 【0080】 Then, as the ball receiving portions 720 of the third connector 70C and the fourth connector 70D move around the imaginary line L2 as an axis, and the connecting end 712A (first extension portion 712) of the ball support portion 710 is inserted into the second gap 725B, the angle between the ball support portion 710 and the ball receiving portion 720, centered on the ball portion 713, changes significantly. 【0081】 In this way, by maintaining the connected state of the third connector 70C and the connected state of the fourth connector 70D, their ball receiving portions 720 move with the imaginary line L2 as the center of motion (axis), allowing the movable plate 60 to be opened as shown in Figure 19. When the movable plate 60 is opened in this way, the lower opening 111 of the main body portion 10 can be exposed. 【0082】 (Cleaning of shielding member 30, etc.) For example, in the heat exchange ventilation device 1 shown in Figure 20(a), when cleaning the inside of the shielding member 30, the movable plate 60 can be opened by releasing the connection of the first connector 70A and the fourth connector 70D, respectively, while maintaining the connection of the second connector 70B and the third connector 70C, respectively, that is, by supporting the movable plate 60 with the second connector 70B and the third connector 70C, as shown by the dashed line. When the movable plate 60 is in the open position, if the gap W60 between the movable plate 60 and the wall 400 is narrow, cleaning the lower opening 111 of the main body 10, etc., which is exposed when the movable plate 60 is opened becomes complicated. 【0083】 In this embodiment, there are four ways to open the movable plate 60. If, instead of the first way of opening described above, the second way of opening is performed, for example as shown in Figure 20(b), by supporting the movable plate 60 with the first connector 70A and the fourth connector 70D near the wall and opening the movable plate 60, a wide working space can be secured below the fixed plate 50, making it easier to clean the inside of the shielding member 30 and the inside of the lower opening 111 of the main body 10. With the movable plate 60 open, it also becomes easier to remove the filter 15A from the filter device 15. 【0084】 In the conventional ventilation device 200 shown in Figure 26, there is only one axis that serves as the center for the opening and closing operation of the cover 222, and its position cannot be changed. Therefore, when the cover 222 is opened and the interior is exposed, the gap w between the cover 222 and the wall 400 may be narrow. This may make cleaning and other operations complicated. 【0085】 Furthermore, in the conventional ventilation device 200 shown in Figure 26, the work can become complicated if the angle θ between the opened cover 222 and the opening is small. However, in the heat exchange ventilation device 1 of this embodiment, the movable plate 60 is positioned vertically when open, allowing for a wide space below the lower opening 111. 【0086】 Thus, according to the heat exchange ventilation device 1 of this embodiment, the opening direction of the movable plate 60 can be arbitrarily selected from four opening methods, regardless of the orientation of the main body 10 located in the ceiling space. Therefore, even when there is a wall nearby, the movable plate 60 can be opened to secure a wide working space. As a result, maintenance such as cleaning of the heat exchange ventilation device 1 can be easily performed. 【0087】 By connecting the fixed plate 50 and the movable plate 60 using the connector set 7, a shielding member 30 can be configured in which four axes that serve as the center of motion for the movable plate 60 can be selected when exposing the lower opening 111. This makes it convenient to move the movable plate 60 relative to the fixed plate 50 by arbitrarily selecting one of the four axes. 【0088】 The heat exchange ventilation device 2, a modified example of the first embodiment shown in Figure 21, includes a linear member 80 with one end fixed to the fixed plate 50 and the other end fixed to the movable plate 60, thereby preventing the movable plate 60 from falling. The attachment point of one end of the linear member 80 may be the ceiling insertion part 40 or the main body part 10 instead of the fixed plate 50. 【0089】 [Second Embodiment] The ventilation device 3 shown in Figures 22(a) and (b) comprises a main body 10A to which the exhaust system duct 92 is connected, and a shielding member 30 fixed to the main body 10A. 【0090】 The main body 10A is connected from the lower opening 111 facing downwards, through the hollow interior, to the interior of the duct connection section protruding from the side. Components identical to those in the above embodiment are denoted by the same reference numerals, and their descriptions are omitted. 【0091】 The ventilation device 3 is positioned with the main body 10A suspended in the space S11 above the ceiling using the metal fittings shown in the figure. The ceiling insertion portion 40 of the shielding member 30 passes through the opening 310 in the ceiling 300, and the ceiling insertion portion 40 is further inserted into the lower opening 111, and the shielding member 30 is fixed to the main body 10A with screws or the like. The fixing plate 50, the movable plate 60, and the connecting device 70 are arranged inside the room. 【0092】 The ventilation device 3 is located at the upstream end of the exhaust system and functions as the aforementioned exhaust port. Unlike the heat exchange type ventilation device 1 of the first embodiment, the ventilation device 3 does not have a heat exchanger or blowers (for supply and exhaust) inside. The ventilation device 3 draws in indoor air from below the ceiling through the gap 55 using a ventilation device with a blower for the downstream exhaust system, which is connected via the exhaust system duct 92. In Figure 22(b), the flow of indoor air is represented by the arrow EA. 【0093】 This exhaust ventilation device 3, like the heat exchange ventilation device 1 described above, is equipped with a shielding member 30, and by selecting how to open the movable plate 60 according to the installation status of the ventilation device 3, a wide working space can be secured below the opening 500 of the fixed plate 50. This makes it easier to perform tasks such as cleaning the inside of the shielding member 30. 【0094】 [Third Embodiment] The air conditioner 4 shown in Figures 23(a) and (b) is a packaged air conditioner that circulates air to provide air conditioning (cooling and heating). The air conditioner 4 comprises a main body 10B that houses a heat exchanger, a blower, etc., and a shielding member 30A that shields the lower opening 131A of the main body 10B facing downwards. Components identical to those in the above embodiment are denoted by the same reference numerals, and their descriptions are omitted. 【0095】 The main body 10B is suspended in the space S11 above the ceiling using the metal fittings shown in the diagram. The shielding member 30A comprises a fixed plate 50 formed in an annular shape, a movable plate 600 with a rectangular outline, and four connecting members 70 that connect the fixed plate 50 and the movable plate 600 and hold the movable plate 600 below the fixed plate 50. 【0096】 Furthermore, unlike the aforementioned movable plate 60, the movable plate 600 has multiple ventilation holes 610 that penetrate in the thickness direction, and the cylindrical portion 620 extends from the flat surface around the multiple ventilation holes 610 to the lower opening 131A, so that indoor air is sent from the holes 610 to the cylindrical portion 620 and then through the lower opening 131A into the main body portion 10B. 【0097】 Furthermore, the shielding member 30A includes an inner cylindrical portion 510 extending from the inner peripheral edge of the fixing plate 50, and an outer cylindrical portion 520 extending from the outer peripheral edge of the fixing plate 50 to the opposite side from the inner cylindrical portion 510. The fixing plate 50, the inner cylindrical portion 510, and the outer cylindrical portion 520 may be molded as a single unit, or they may be molded separately and then combined into a single unit. 【0098】 With the inner cylinder portion 510 passed through the lower opening 131A of the main body portion 10B, the fixing plate 50 is fixed to the mounting portion 131 which is provided with the lower opening 131A. 【0099】 The movable plate 600 is positioned below the fixed plate 50 by four connectors 70, shielding the lower opening 131A and the opening 500 of the fixed plate 50. In this state, the outer cylinder 520 surrounds the connectors 70 and the movable plate 600. Note that in Figure 23(b), the internal components of the main body 10B, such as the heat exchanger and blower, are omitted. 【0100】 In the air conditioner 4, as shown by arrow A1, indoor air is drawn into the main body 10B through the holes 610 in the movable plate 600, and after heat exchange, the conditioned air is returned to the room as shown by arrow A2. The air conditioner 4 has four outlets to blow the conditioned air in four directions, and each outlet is provided with a louver 181. 【0101】 In this type of air conditioner 4, similar to the heat exchange ventilation device 1 described above, the movable plate 600 is connected to the fixed plate 50 via four connectors 70, and by selecting how to open the movable plate 600, a wide working space can be secured below when the movable plate 600 is open. This makes it easier to perform tasks such as cleaning the inside of the shielding member 30A. Furthermore, the air conditioner is not limited to being solely for circulating indoor air; it may also circulate indoor air while simultaneously exhausting a portion of the indoor air and supplying outside air. Additionally, it is not limited to a packaged type; a separate type is also acceptable. 【0102】 [Fourth Embodiment] The ventilation structure 5 shown in Figure 24 provides ventilation between the floor gap 5A, which forms an airflow path, and the living room adjacent to the floor gap 5A, separated by the ceiling 300. The shielding member 30 shields the ventilation opening 310 formed in the ceiling 300. For example, the floor gap 5A is a space formed between the ceiling 300 of the first floor and the floor 350 of the second floor, and is configured to be highly airtight. Components identical to those in the above embodiment are denoted by the same reference numerals, and their descriptions are omitted. 【0103】 The shielding member 30 is attached by fixing the fixing plate 50 to the interior side of the ceiling with screws or the like, with the ceiling insertion portion 40 passing through the opening 310 in the ceiling 300. 【0104】 In this ventilation structure 5, for example, a heat exchange ventilation device (not shown) is provided in the inter-floor space 5A. This heat exchange ventilation device supplies air to the inter-floor space 5A, causing outside air to flow through the inter-floor space 5A and then be supplied into the room via the shielding member 30. 【0105】 Thus, in the ventilation structure 5, the shielding member 30 is provided, allowing the opening of the movable plate 60 to be selected, and a wide working space can be secured below the opening 500 of the fixed plate 50. This makes it easier to perform tasks such as cleaning the shielding member 30 and the space between floors 5A. 【0106】 The present invention can be implemented in any way not limited to the above description and illustrated examples. 【0107】 The ventilation device 3 shown in Figure 22, although not shown in the illustration, preferably includes a filter to collect foreign matter contained in the air drawn in through the gap 55. This filter is, for example, made of multiple synthetic resin fibers stretched over a frame, and is provided in the ventilation device 3 in a replaceable manner, and can be removed by opening the movable plate 60. The ventilation device 3 for supplying air may also have a filter inside. 【0108】 Alternatively, instead of installing the ventilation device 3 at the upstream end of the exhaust system, it may be installed at the downstream end of the supply air system and function as the aforementioned air intake. For example, a ventilation system equipped with an upstream blower connected to the ventilation device 3 via the supply air system duct supplies outside air into the room through the gap 55 between the fixed plate 50 and the movable plate 60. In this case, the air flows in the opposite direction to the exhaust direction EA shown in Figure 22(b). 【0109】 Furthermore, although not shown in the illustration, the ventilation device 3 for exhaust or supply air may also be equipped with a blower inside. 【0110】 In the above embodiment, the shielding member is shown to shield the lower opening of the ventilation device, the lower opening of the air conditioner, and the vent formed in the ceiling. However, the vents that the shielding member shields are not limited to these. For example, vents for ventilation or air conditioning in a building may be provided in a wall, for example. Also, vents are not limited to the indoor side, but may be on the outdoor side, such as the exterior wall or under the eaves. The direction in which the vent faces the ventilation device or air conditioner is not limited; for example, devices with vents facing sideways or upwards can also be included. Here, reference numeral 100 in Figure 25 represents a vent for ventilation or air conditioning in a building, or a vent of a ventilation device or air conditioner fixed to the building, and shows the state in which the shielding member 30 is shielding the vent 100. The z-axis of the shielding member 30 penetrates the opening 500 of the fixing plate 50 and is positioned so that the z-coordinate increases toward the vent 100 side. In this configuration, the vent 100 is open facing the opposite direction of the z-axis, and the opening 500 of the fixed plate 50 is positioned offset from the vent 100 in the opposite direction of the z-axis. Furthermore, the movable plate 60 is positioned by the connector 70 offset from the opening 500 of the fixed plate 50 in the opposite direction of the z-axis, thereby shielding the opening 500 of the fixed plate 50 and the vent 100. At this time, the z-axis is not limited to being vertically aligned, nor is the z-axis direction limited to upward. Also, the vent 100 shielded by the shielding member 30 can be either an intake or an exhaust. The ventilation device or air conditioner equipped with the vent 100 is not limited to being located in the ceiling space, inside the walls, or under the floor of a building, but may also be mounted on a wall and placed inside a living space. Furthermore, the z-axis is not limited to passing through the center of the opening in the fixed plate; it is sufficient if it is positioned through the opening in the fixed plate and the four connecting parts divide the coordinates projected onto the xy-plane into the first to fourth quadrants, respectively. 【0111】 (Fixed plate) In the above embodiment, the contour was formed in the shape of a right quadrilateral, with the four corners 51 provided as opposing corners facing the corners of the movable plate. However, the shape is not limited to this, as long as there are four opposing corners facing each of the four corners of the movable plate. 【0112】 (movable plate) Although the movable plate in the above embodiment was equipped with a third reinforcing portion, this third reinforcing portion may be omitted, or its protruding height and dimensions may be changed. 【0113】 (Connector) In the above embodiment, the ball support portion is provided on the fixed plate and the ball receiving portion is provided on the movable plate. However, the ball support portion may be provided on the movable plate, and the ball receiving portion may also be provided on the movable plate to constitute the shielding member. 【0114】 (Ball support section) The ball support is not limited to the configuration shown in the illustration, and may have a ball portion and a connecting end that passes through the first and second gaps of the gripping portion. As long as it does not collide with the gripping portion when the movable plate is opened, the structure on the opposite side of the connecting end is not limited and may be, for example, a base. In addition, the ball portion may be provided with the notches and recesses omitted, and these areas may also be used to form a spherical surface. The ball support section may be made of metal, as a so-called ball stud. When the ball support is provided on a movable plate having a third reinforcing portion, the ball support may include a contact portion that abuts against the connection portion of the third reinforcing portion. By abutting the contact portion against the connection portion of the third reinforcing portion, the ball support can be positioned. 【0115】 (Ball receiving section) The ball receiving portion is not limited to the configuration shown in the figure. For example, the second extension shown in Figure 9 is formed in a cylindrical shape, but the second extension may be rod-shaped or a larger base than the gripping portion, as long as it supports the gripping portion. The ball receiving portion may be configured without the contact portion that comes into contact with the connection portion of the third reinforcing portion. The gripping portion is not limited to four, as long as it has a first gap and a second gap. By changing the height of the edge of the pad portion of the gripping part that contacts the connecting end of the ball support, the maximum opening angles θ1 and θ2 of the movable plate can be made smaller than 90 degrees. [Explanation of symbols] 【0116】 1,2 Heat exchange ventilation system 3. Ventilation system 4. Air conditioner 5. Ventilated structure 5A Floor 10 Main body 111,131A Bottom opening 20 Duct connection section 30,30A shielding member 40 Ceiling insertion section 44 Mounting part 50 Fixed plate 500 aperture 50A First edge 50B Second Edge 51 Corner section (opposite corner section) 60,600 Movable plate 60A First Edge 60B Second Edge 61 Corner 7 Connector Set 70 Connectors 70A First connector 70B Second connector 70C Third connector 70D Fourth connector 710 Ball support section 711 First Base Section 712 First extension 713 Ball Club 714 First reinforcement section 720 Ball receiving section 721 Second Base Section 722 Second extension part 723 Gripping part 723A Pad section 723B Retaining part 723E Ball Entrance / Exit 724 Second reinforcement part 725A First gap 725B Second gap 725C Third gap 725D Fourth gap 100 vents CL1, CL2 clearance

Claims

[Claim 1] A ventilation device comprising a main body positioned in the space above the ceiling and connected to a duct, and a shielding member that shields the lower opening of the main body for ventilation facing downward, The shielding member is, A fixing plate formed in an annular shape with an opening positioned below the lower opening, A movable plate and The system includes a connector that connects the fixed plate and the movable plate, The movable plate has a pair of first edges extending in the x-axis direction, passing through the opening of the fixed plate and increasing in the z-axis direction as the z-coordinate increases from the opening upwards along the x-axis perpendicular to the z-axis, and a pair of second edges extending in the y-axis direction, increasing in the y-coordinate along the y-axis perpendicular to the z-axis and the x-axis, and its contour is formed in the shape of a right quadrilateral. The connecting members are positioned between the corner of the movable plate and the corner-facing portion of the fixed plate that is opposite to this corner. Furthermore, the aforementioned connector, A ball support portion protrudes from one of the opposing surfaces of the corner portion of the fixed plate and the corner portion of the movable plate, and has a ball portion at its tip, The ball receiving portion is made of synthetic resin and protrudes from the opposing corner portion of the fixed plate and the other opposing surface of the corner portion of the movable plate, and has a gripping portion at its tip for detachably gripping the ball portion. With the four connectors connecting the ball support portion and the ball receiving portion, the movable plate is positioned at a distance from the fixed plate in the opposite direction to the z axis, where the z coordinate decreases along the z axis, and the lower opening is shielded. A ventilation device characterized in that, when the lower opening is exposed by moving the movable plate from a state in which the lower opening is shielded by the movable plate, two of the four connecting members, which are arranged in the x-axis direction or the y-axis direction, maintain a state in which the ball support portion and the ball receiving portion are connected, thereby forming an axis that is the center of the movement of the movable plate, and furthermore, four such axes are provided so that they can be selected. [Claim 2] The gripping portion is, A pad portion having a hemispherical inner surface, The ventilation device according to claim 1, further comprising: a plurality of pressing portions that protrude from the periphery of the pad portion and elastically contact a hemispherical portion on the surface of the ball portion that is opposite to the hemispherical portion that is in contact with the pad portion. [Claim 3] With the movable plate covering the lower opening, the gripping portion is provided with a plurality of pressing portions around the central axis of the gripping portion extending in the opposite direction to the z-axis, and a first gap and a second gap formed between the pressing portions. When the four connectors are projected onto the xy-plane, one connector lies in the first quadrant, one connector in the second quadrant, one connector in the third quadrant, and one connector in the fourth quadrant. In the connector in the first quadrant, the first gap is in the x-axis direction relative to the central axis, and the second gap is in the y-axis direction relative to the central axis. In the connector in the second quadrant, the first gap is in the opposite direction to the x-axis from the central axis, and the second gap is in the y-axis direction from the central axis. In the connector in the third quadrant, the first gap is in the opposite direction to the x-axis from the central axis, and the second gap is in the opposite direction to the y-axis from the central axis, In the connector in the fourth quadrant, the first gap is in the x-axis direction relative to the central axis, and the second gap is in the opposite direction to the y-axis relative to the central axis. The ball support portion is formed to be thinner than the ball portion and has a connecting end that connects to the ball portion. The ventilation device according to claim 2, characterized in that when the lower opening is exposed, if the two connectors that maintain the connected state of the ball support portion and the ball receiving portion are aligned in the x-axis direction, the connecting end of the ball support portion is inserted into the second gap, and if the two connectors that maintain the connected state of the ball support portion and the ball receiving portion are aligned in the y-axis direction, the connecting end of the ball support portion is inserted into the first gap. [Claim 4] The ventilation device according to claim 1, characterized in that the ball support portion is made of synthetic resin. [Claim 5] The ball support portion is A first base portion fixed to one of the opposing surfaces, A first extension portion extending vertically from the first base portion and having the connecting end at its tip, The ball portion connected to the connecting end of the first extension, A portion protruding from the first base portion connects to the side surface of the first extension portion (excluding the connecting end). The ventilation device according to claim 3, characterized in that it comprises at least one first reinforcing part that supports the first extension part. [Claim 6] The aforementioned ball receiving portion is A second base portion fixed to the other opposing surface, A second extension extending vertically from the second base portion, The gripping portion provided at the tip of the second extension, The ventilation device according to claim 1, further comprising: at least one second reinforcing portion that protrudes from the second base portion and is connected to the side surface of the second extension portion, and supports the second extension portion. [Claim 7] The ventilation device according to claim 1, characterized in that the ball support portion is provided on the corner opposite portion of the fixed plate and the ball receiving portion is provided on the corner portion of the movable plate. [Claim 8] The movable plate is provided with a third reinforcing portion that protrudes from the surface facing the fixed plate, The third reinforcing portion comprises a first projection extending in the x-axis direction, a second projection extending in the y-axis direction, and a connecting portion formed by the connection of the first projection and the second projection, and positioned close to the corner of the movable plate, and its contour is formed in the shape of a right quadrilateral. The ventilation device according to claim 1, characterized in that the ball support portion or ball receiving portion provided on the movable plate further comprises a contact portion that contacts the first protrusion and the second protrusion that constitute the connection portion of the third reinforcing portion. [Claim 9] The main body is equipped with a filter for collecting foreign matter. The ventilation device according to any one of claims 1 to 8, characterized in that the filter is configured to be inserted into and removed from the main body through the lower opening. [Claim 10] The ventilation device according to any one of claims 1 to 8, characterized in that the main body is equipped with a blower. [Claim 11] The ventilation device according to claim 10, characterized in that the blower comprises an exhaust blower and an intake blower, and the main body is equipped with a heat exchanger that performs heat exchange between outside air and indoor air. [Claim 12] An air conditioner with a lower opening that overlooks the room below the ceiling, A shielding member is provided to cover the lower opening, The shielding member is, A fixing plate formed in an annular shape with an opening positioned below the lower opening, A movable plate and The system includes a connector that connects the fixed plate and the movable plate, The movable plate has a pair of first edges extending in the x-axis direction, passing through the opening of the fixed plate and increasing in the z-axis direction as the z-coordinate increases from the opening upwards along the x-axis perpendicular to the z-axis, and a pair of second edges extending in the y-axis direction, increasing in the y-coordinate along the y-axis perpendicular to the z-axis and the x-axis, and its contour is formed in the shape of a right quadrilateral. The connecting members are positioned between the corner of the movable plate and the corner-facing portion of the fixed plate that is opposite to this corner. Furthermore, the aforementioned connector, A ball support portion protrudes from one of the opposing surfaces of the corner portion of the fixed plate and the corner portion of the movable plate, and has a ball portion at its tip, The ball receiving portion is made of synthetic resin and protrudes from the opposing corner portion of the fixed plate and the other opposing surface of the corner portion of the movable plate, and has a gripping portion at its tip for detachably gripping the ball portion. With the four connectors connecting the ball support portion and the ball receiving portion, the movable plate is positioned at a distance from the fixed plate in the opposite direction to the z axis, where the z coordinate decreases along the z axis, and the lower opening is shielded. An air conditioner characterized in that, when the lower opening is moved from a state in which the lower opening is shielded by the movable plate to an exposed state by moving the movable plate, two of the four connecting members, which are arranged in the x-axis direction or the y-axis direction, maintain a state in which the ball support portion and the ball receiving portion are connected, thereby forming an axis that is the center of the movement of the movable plate, and furthermore, four such axes are provided so as to be selectable. [Claim 13] A ventilation structure that allows air to circulate between floors forming a flow path and between adjacent rooms separated by the ceiling, The ceiling is equipped with a shielding member that covers the ventilation opening formed therein. The shielding member is, A fixing plate formed in an annular shape with an opening positioned below the ventilation opening, A movable plate and The system includes a connector that connects the fixed plate and the movable plate, The movable plate has a pair of first edges extending in the x-axis direction, passing through the opening of the fixed plate and increasing in the z-axis direction as the z-coordinate increases from the opening upwards along the x-axis perpendicular to the z-axis, and a pair of second edges extending in the y-axis direction, increasing in the y-coordinate along the y-axis perpendicular to the z-axis and the x-axis, and its contour is formed in the shape of a right quadrilateral. The connecting members are positioned between the corner of the movable plate and the corner-facing portion of the fixed plate that is opposite to this corner. Furthermore, the aforementioned connector, A ball support portion protrudes from one of the opposing surfaces of the corner portion of the fixed plate and the corner portion of the movable plate, and has a ball portion at its tip, The ball receiving portion is made of synthetic resin and protrudes from the opposing corner portion of the fixed plate and the other opposing surface of the corner portion of the movable plate, and has a gripping portion at its tip for detachably gripping the ball portion. With the four connectors connecting the ball support portion and the ball receiving portion, the movable plate is positioned at a distance from the fixed plate in the opposite direction to the z axis, where the z coordinate decreases along the z axis, and the ventilation opening is shielded. A ventilation structure characterized in that, when the movable plate is moved from a state in which the ventilation opening is shielded by the movable plate to expose the ventilation opening, two of the four connectors, which are arranged in the x-axis direction or the y-axis direction, maintain a state in which the ball support portion and the ball receiving portion are connected, thereby forming an axis that is the center of the movement of the movable plate, and furthermore, four such axes are provided so that they can be selected. [Claim 14] A shielding member for shielding ventilation openings or air conditioning openings in a building, or ventilation openings for a ventilation device or air conditioner fixed to the building, A fixing plate formed in an annular shape with an opening leading to the ventilation opening, A movable plate and The system includes a connector that connects the fixed plate and the movable plate, The movable plate has a pair of first edges extending in the x-axis direction, where the x-coordinate increases along the x-axis perpendicular to the z-axis, which increases as you move from the opening of the fixed plate toward the ventilation opening, and a pair of second edges extending in the y-axis direction, where the y-coordinate increases along the y-axis, which is perpendicular to the z-axis and the x-axis, and the contour is formed in the shape of a right quadrilateral. The connecting members are positioned between the corner of the movable plate and the corner-facing portion of the fixed plate that is opposite to this corner. Furthermore, the aforementioned connector, A ball support portion protrudes from one of the opposing surfaces of the corner portion of the fixed plate and the corner portion of the movable plate, and has a ball portion at its tip, The ball receiving portion is made of synthetic resin and protrudes from the opposing corner portion of the fixed plate and the other opposing surface of the corner portion of the movable plate, and has a gripping portion at its tip for detachably gripping the ball portion. With the four connectors connecting the ball support portion and the ball receiving portion, the movable plate is positioned at a distance from the fixed plate in the opposite direction to the z axis, where the z coordinate decreases along the z axis, and the ventilation opening is shielded. A shielding member characterized in that, when the movable plate is moved from a state in which the vent is shielded by the movable plate to expose the vent, two of the four connecting members, which are arranged in the x-axis direction or the y-axis direction, maintain a state in which the ball support portion and the ball receiving portion are connected, thereby forming an axis that is the center of the movement of the movable plate, and furthermore, four such axes are provided so that they can be selected. [Claim 15] A set of four connectors for connecting a ring-shaped fixed plate and a movable plate whose contour, which is formed in the shape of a right quadrilateral, is formed to shield the ventilation opening of the fixed plate, and for positioning four axes parallel to the contour of the movable plate, which are formed by imaginary lines connecting the ball portions, when the opening of the fixed plate is exposed, the axes that serve as the center of the movement of the movable plate, which are formed by imaginary lines connecting the ball portions, The aforementioned connector is A ball support portion is attached to one of the fixed plate and the movable plate, and has the ball portion at its tip via a connecting end that is formed to be thinner than the ball portion, It is attached to the other of the fixed plate and the movable plate, and comprises a ball receiving part made of synthetic resin having a gripping part at its tip for detachably gripping the ball part, The gripping portion is, A pad portion having a hemispherical inner surface, The ball portion comprises a plurality of pressing portions that protrude from the periphery of the pad portion and elastically contact the hemispherical portion on the surface of the ball portion that is opposite to the hemispherical portion that is in contact with the pad portion, Multiple of the aforementioned pressing portions are provided surrounding the central axis of the gripping portion, A connector set characterized in that, when the ball support portion and the ball receiving portion are connected, a gap into which the connecting end of the ball support portion can be inserted is formed between the pressing portions in a first direction perpendicular to the central axis and a second direction perpendicular to both the central axis and the first direction, respectively. [Claim 16] The aforementioned ball receiving portion is A second base portion fixed to the aforementioned fixed plate or the aforementioned movable plate, A second extension extending vertically from the second base portion, The gripping portion provided at the tip of the second extension, It comprises a second reinforcing portion extending vertically from the second base portion, The connector set according to claim 15, characterized in that the second reinforcing portion extends through the side surface of the second extension portion to the side surface of one of the pressing portions positioned between the two gaps.

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